Lowering-jack



(No Model.)

` A. P. GOULD. LOWERING JACK.

No. 484,587. Patented Oct. 18, 1892.

UNTTEDy STATES PATENT ErrcE.

AARON P. GOULD, OF CANTON, OHIO.

LowERiNG-JACK.

SPECIFICATION forming part of Letters Patent N o. 484,587, dated October 18, 1892.

Application filed May 13, 1.892. Serial No. 43 2,868. (No model.)

To @ZZ whom it may concern:

Be it known that I, AARON P. GOULD, a citizen of the United States, and a resident of Canton, county of Stark, State of Ohio, have invented a new and useful Improvement in Lowering-Jacks, of which the following is a full, clear, and exact description, reference beinghad to the accompanying drawings,mak ing part of this specification.

My invention relates to jacks for lowering heavy objects or structures-such, for instance, as a house after the street-grade has been changed, in which case it will be necessary to employ several jacks to properly support the house.

The invention has for its obj ect to construct a jack of the above character which will lower the object with which it is engaged at uniform self-regulated speed and which will be simple in construction and comparatively inexpensive of production.

Vith these objects in View, the invention consists in certain features of construction and combination of parts of the same which will be hereinafter fully described and claimed.

In the drawings, Figure l is a perspective view of myimprovedjack with aportion ofthe tubular base broken away. Fig. 2 is a vertical sectional view of the same; and Fig. 3 is a detailed perspective View of the brake mechanism, the parts thereof being separated.

A in the drawing denotes a tubular base, to the upper end of which is secured a brakechamber B, provided at its upper end with a removable cap O, having a central aperture D. Located within this chamber is the brake mechanism, consisting of an interiorly-screwthreaded nut E, havingdiametrically-opposite upper and lower lugs F and G, respectively.

I-I denotes the brake-shoes, which are preferably semicircnlar in construction and each provided with upper and lower lugs I J on their concave surfaces, and which are pivotally secured to the nut E, to swing outward- 1y, by the X-links K, the arms thereof of one side having their extremities bent upwardly to take into holes in the lugs of the brakeshoes, and having the extremities of the opposite sides thereof bent downward, as shown, to take into the holes in the lugs F and G of the nut E. A spring O is provided, the ends of which are bent downward to enter perforations P in the upper ends of the brake-shoes, thus pivotally securing the spring to the shoes. The energy of this'spring is exerted outwardly with just sufficient force to hold the shoes in contact with the inner wall of the brakechamber.

Q denotes the supporting-screw, having a pitch to correspond to the pitch of the nut, and to which is secured, or upon which is supported, the object to be lowered. This screw passes through the nut, and its lower end is located in the tubular base.

The brake-shoes may have on their convex surfaces inlaid packings R, of leather or the like, to deaden the sound when they come in vcontact with the wall of the chamber, as well as to increase the friction.

S denotes guide-rods, which are fastened to the upper end of the supporting-screw and work through lugs T, secured to the sides of the brake-chamber, and serve to prevent the screw turning.

In operation, the downward movement of the supporting-screw carrying its load will rotate the nut and brake-shoes, the outer ends ofthe X-link throwing'the brake-shoes against the inner wall of the brake-chamber by the iinpelling centrifugal force caused by the r0- tation of the nut E, thus establishing a friction between the inner wall of the chamber and the brake-shoes, which will resist the rotary movement of the nut and thereby regulate the downward movement of the load su pported by the screw. A desired speed of descent may be attained by a proper adjustment of parts-as, for instance, by varying the size of the cylinder or the pitch of the thread of the nut and screw.

Having thus described my invention, I claim and desire to secure by Letters Patent of the United Statesl. In combination, a screw-threaded supporting-rod, a screw-threaded nut adapted thereto, convex brake-shoes pivotally secured to said nut, and a fixed brake-chamber, with the walls of which the brake-shoes are brought into frictional engagement by the rotation of the nut.

2. In combination, a screwthreaded supporting-rod, a threaded nut adapted thereto, a fixed brake-chamber, brake-shoes pivoted to IOO to said nut to turn therewith and swing therer 5 from.

5. In combination, a vertically movable non-rotatable screw-threaded supporting-rod, a. nut adapted thereto, :1I brake-chamber, and brake-shoes pivoted to said nut to turn therezo with and swing therefrom to engage the Wall of said brake-chamber.

In testimony whereof I have hereunto set my hand, this 11th day of May, A. D. 1892.

' AARON P. GOULD. Witnesses:

W. K. MILLER, v CHAS. R. MILLER.- 

